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Another thing:

I am pretty sure that reading lot's of books trains Concentration.
Right now I am playing an orcish merchant and wished for concentration. I found book shop - so it seemed like a...

Yup... it is pretty obvious once you notice literacy increase after each visit to the graveyard.

I have one thing that falls into category: minor but undocumented

Reading text on the graves trains literacy. Haven't seen it neither in guidebook nor in wiki.